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arXiv 2201.03836physics.plasm-ph
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托卡马克等离子体中各向异性高能粒子驱动不稳定性的回旋动力学模拟

Gyrokinetic modelling of anisotropic energetic particle driven instabilities in tokamak plasmas

Brando Rettino, Thomas Hayward-Schneider, Alessandro Biancalani, Alberto Bottino, Philipp Lauber, Ilija Chavdarovski, Francesco Vannini, Frank Jenko

摘要:

中性束产生的高能粒子在托卡马克装置中激发了高能粒子驱动的测地声学模(EGAM)。我们研究了高能粒子分布函数的各向异性对这种不稳定性的激发与ORB 5,一个回旋粒子在细胞的代码。数值结果显示与ORB 5的线性静电模拟。的增长率被发现是敏感地依赖于相空间形状的分布函数。的不稳定性的行为进行定性比较的色散关系的理论分析。利用加热求解器RABBIT得到了真实的中性束高能粒子各向异性分布,并作为输入分布函数引入到ORB 5中。结果表明,依赖于注入角的增长率。实验测量的定性比较,发现它们之间的一些分歧,在模拟的增长率远低于从实验。的差异的解释是先进的。

英文摘要:

Energetic particles produced by neutral beams are observed to excite energetic-particle-driven geodesic acoustic modes (EGAMs) in tokamaks. We study the effects of anisotropy of distribution function of the energetic particles on the excitation of such instabilities with ORB5, a gyrokinetic particle-in-cell code. Numerical results are shown for linear electrostatic simulations with ORB5. The growth rate is found to be sensitively dependent on the phase-space shape of the distribution function. The behavior of the instability is qualitatively compared to the theoretical analysis of dispersion relations. Realistic neutral beam energetic particle anisotropic distributions are obtained from the heating solver RABBIT and are introduced into ORB5 as input distribution function. Results show a dependence of the growth rate on the injection angle. A qualitative comparison to experimental measurements is presented and few disagreements between them are found, being the growth rate in the simulations much lower than that from experiments. An explanation for the difference is advanced.

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